Author Affiliation: Departments of Neurology and Psychiatry, University of California, Los Angeles.
PARKINSON DISEASE (PD) is second only to Alzheimer disease in frequency as
a neurodegenerative disorder in the United States. At least a half a
million Americans are affected, producing an annual societal cost of
$20 billion.1 Most cases of PD begin after age 50 years and
there is an increasing age-related prevalence to at least age 80 years.
Among individuals older than 70 years, 1.5% to 2.5% have
PD.2 With the increasing age of the population and growth
of the number of elderly individuals, a substantial increase in PD can
be anticipated. This changing demographic creates a scientific
imperative to better understand the causes of PD and improve management
of its symptoms.
Cummings JL. Understanding Parkinson Disease. JAMA. 1999;281(4):376-378. doi:10-1001/pubs.JAMA-ISSN-0098-7484-281-4-jed80123